Having been separated for many years, Jiang Zhiwei returns to the old Jiang family residence and moves into a creepy bedroom. Behind the mirror, she sees a mysterious figure who looks identical to her. Bizarre occurrences happen in the household one after another, such as stolen collectibles and family members suddenly falling ill. Step by step, Jiang Zhiwei investigates to gradually uncover the truth behind her twin sister's disappearance. Moving among family members who each harbor their own hidden motives, she pushes aside the lies and disguises, searches for evidence, confronts the family's hidden conflicts, and completes her own self-perseverance and reconciliation with family affection.